SN4 ""

No	Pattern	Freq
1	have [adv] been [prep]	13
2	have [adv] been [prep]	13
3	have still been [prep]	6
4	have still been [prep]	6
5	[modal v] have been [prep]	1243
6	[vb mod] have been [prep]	1243
7	would have been [prep]	428
8	would have been [prep]	392
9	must have been [prep]	289
10	must have been [prep]	289
11	[adv] have been [prep]	258
12	[adv] have been [prep]	151
13	may have been [prep]	145
14	may have been [prep]	145
15	might have been [prep]	132
16	might have been [prep]	132
17	should have been [prep]	113
18	should have been [prep]	113
19	[not/n't] have been [prep]	107
20	not have been [prep]	107
21	could have been [prep]	99
22	could have been [prep]	99
23	not have been [prep]	69
24	n't have been [prep]	38
25	'd have been [prep]	36
26	will have been [prep]	36
27	will have been [prep]	33
28	well have been [prep]	28
29	well have been [prep]	28
30	never have been [prep]	20